[Dsg-hallb_magnets] [New Comment] Torus LHe Liquid Level Low - LL8120DP Interlock

[tlemon at jlab.org]

Comments:
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 - by tlemon on Thu, 12/20/2018 - 11:48.

LL8120DP correlation with Torus current/ramping - Looking back at archived data from October 2018 to today, there was only one other occasion on 2018-12-10 at ~06:00 where LL8120DP decreased as Torus was ramping to zero, but it did not drop below 65%.

It does not appear that every time the Torus ramps to zero, the LHe Liquid Level also decreases.


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Logentry Text:
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While Torus was ramping to zero A this morning, the controlled ramp down interlock for LHe Liquid Level for sensor LL8120DP tripped.

The interlock trip level was verified on the PLC to be 65% with a delay time of 1 second.

The archiver shows that LL8120DP dropped below 65% for ~1.4 seconds before returning to ~70%.

Since the liquid level reading is back within limits, the interlock was reset using the EPICS button.





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